Rutland Products 10624 1/4-Inch by 4-Foot Fiberglass Extension Rod Excellent fiberglass rods will fit all Rutland brushes with 1/4 NPT threading Perfect for cleaning your chimney from the top down or up through your fireplace 0.350 diameter Long lasting, homeowner chimney cleaning rods 1/4 National Pipe Threading (NPT) fittings Fiberglass extension rod Standard duty Fits chimney sweep brushes Brown 1/4-Inch threading